Prof. Mahmood Abu Al shaeer

Al rafidain university


Scopus Publications

Scopus Publications

  • Wireless Drone Charging Station Using Class-E Power Amplifier in Vertical Alignment and Lateral Misalignment Conditions
    Aqeel Mahmood Jawad, Rosdiadee Nordin, Haider Mahmood Jawad, Sadik Kamel Gharghan, Asma’ Abu-Samah, Mahmood Jawad Abu-Alshaeer, and Nor Fadzilah Abdullah

    Recent major advancements in drone charging station design are related to the differences in coil design between the material (copper or aluminum) and inner thickness (diameter design) to address power transfer optimization and increased efficiency. The designs are normally challenged with reduced weight on the drone’s side, which can lead to reduced payload or misalignment position issues between receiver and transmitter, limiting the performance of wireless charging. In this work, the coil combination was tested in vertical alignment from 2 cm to 50 cm, and in lateral misalignment positions that were stretched across 2, 5, 8, 10, and 15 cm ranges. Simulated and experimental results demonstrated improved transfer distances when the drone battery load was 100 Ω. With the proposed design, the vertical transfer power that was achieved was 21.12 W, 0.460 A, with 81.5% transfer efficiency, while the maximum lateral misalignment air gap that was achieved was 2 cm with 19.22 W and 74.15% efficiency. This study provides evidence that the developed circuit that is based on magnetic resonant coupling (MRC) is an effective technique towards improving power transfer efficiency across different remote and unmanned Internet of Things (IoT) applications, including drones for radiation monitoring and smart agriculture.

  • Improvement of the Methodology of Building a System of Phase Synchronization of Coherent Demodulators in Telecommunication Control Systems and Distance Learning
    Haider Mahmood Jawad, Mahmood Jawad Abu-AlShaeer, Serhii Yevseiev, Valery Kornienko, and Oleksandr Turovsky

    One of the factors of internal disturbances and obstacles in the operation of the system of synchronization of coherent demodulators of telecommunication control systems and remote learning, which directly affect the efficiency of the entire system, are transient processes caused by the system's reaction to the transition from one stationary state to another stationary state. At the current stage of research devoted to the issue of minimizing the influence of the transient process on the operation of the phase synchronization system, increasing the speed and reducing the transient component of the phase error, which is generated by transient processes, was solved by the synthesis of an open connection under the condition of minimizing the phase error in the stable and transient modes of operation of the synchronization system. The solution of the specified task was solved by the method of synthesis of an open connection, the link of which had a permanent structure. As an improvement of the methodology for building a system of phase synchronization of coherent demodulators for telecommunication control and distance learning systems, a mathematical model and a method based on it are proposed in the work, which allows for the synthesis of the open link of the combined synchronization system with a variable structure. Thanks to this, further minimization of the influence of transient processes on the efficiency of the synchronization system of the coherent demodulator is ensured. The scheme of open communication with a variable structure proposed in the paper allows to minimize the influence of the transient process on the efficiency of the synchronization system by influencing the time of the transient process. The assessment carried out in the work of the possibility of an open connection link with a variable structure in terms of the influence on the time of the transient process in the system showed that by logically switching to an open connection branch with the appropriate values of the time operator, it is possible to achieve up to 6 or more times the reduction of the time of the transient process in compared to the transient process in a system with a stable scheme of an open communication link. This ensures an increase in the efficiency of receiving the input signal by the coherent demodulator and affects the quality of data transmission in telecommunication control and distance learning systems.

  • Near Field WPT Charging a Smart Device Based on IoT Applications

  • F-J Antenna Structure Compact Size with Impedance Ratio 13:1 Excited by Tapered CPW
    Amer T. Abed, Aqeel M. Jawad, Haider M. Jawad, and Mahmood J. Abu-Alshaeer

    This research presented a novel of (F-J) antenna, where the tapered feeding strip line fed a frame that loops back to the ground. Within this frame, branches forming the structures F and J. The antenna has measured wide impedance bandwidth of 3.4-30 GHz that can be used for many wireless communications such as WiMAX (3.4GHz–3.6GHz /5GHz– 6GHz), Wi-Fi (5GHz–5.8GHz), 5G (5-6 and 27-28 GHz), ultra wideband (UWB) (3.1–10.6 GHz), and multichannel video and data distribution service (MVDDS) (12.2–12.7 GHz). . The effect of varying the dimensions of some parameters and the surface current distribution had been investigated carefully in this research to optimize the dimensions of the proposed antenna. A good matching was observed between the measured and the simulated data for the reflection coefficient, the radiation patterns and the gain.

  • Optical soliton perturbation with exotic forms of nonlinear refractive index
    Anwar Ja’afar Mohamad Jawad, Mahmoud Jawad Abu-AlShaeer, Elsayed M.E. Zayed, Mohamed E.M. Alngar, Anjan Biswas, Mehmet Ekici, Abdullah Kamis Alzahrani, and Milivoj R. Belic

    Elsevier BV

  • Impact of land surface changes on air temperatures in Baghdad

  • Accurate Empirical Path-Loss Model Based on Particle Swarm Optimization for Wireless Sensor Networks in Smart Agriculture
    Haider Mahmood Jawad, Aqeel Mahmood Jawad, Rosdiadee Nordin, Sadik Kamel Gharghan, Nor Fadzilah Abdullah, Mahamod Ismail, and Mahmood Jawad Abu-AlShaeer

    Institute of Electrical and Electronics Engineers (IEEE)
    Wireless sensor networks (WSNs) have received significant attention in the last few years in the agriculture field. Among the major challenges for sensor nodes’ deployment in agriculture is the path loss in the presence of dense grass or the height of trees. This results in degradation of communication link quality due to absorption, scattering, and attenuation through the crop’s foliage or trees. In this study, two new path-loss models were formulated based on the MATLAB curve-fitting tool for ZigBee WSN in a farm field. The path loss between the router node (mounted on a drone) and the coordinator node was modeled and derived based on the received signal strength indicator (RSSI) measurements with the particle swarm optimization (PSO) algorithm in the farm field. Two path-loss models were formulated based on exponential (EXP) and polynomial (POLY) functions. Both functions were combined with PSO, namely, the hybrid EXP-PSO and POLY-PSO algorithms, to find the optimal coefficients of functions that would result in accurate path-loss models. The results show that the hybrid EXP-PSO and POLY-PSO models noticeably improved the coefficient of determination (R2) of the regression line, with the mean absolute error (MAE) found to be 1.6 and 2.7 dBm for EXP-PSO and POLY-PSO algorithms. The achieved R2 in this study outperformed the previous state-of-the-art models. An accurate path-loss model is essential for smart agriculture application to determine the behavior of the propagated signals and to deploy the nodes in the WSN in a position that ensures data communication without unnecessary packets’ loss between nodes.

  • Wireless power transfer with magnetic resonator coupling and sleep/active strategy for a drone charging station in smart agriculture
    Aqeel Mahmood Jawad, Haider Mahmood Jawad, Rosdiadee Nordin, Sadik Kamel Gharghan, Nor Fadzilah Abdullah, and Mahmood Jawad Abu-Alshaeer

    Institute of Electrical and Electronics Engineers (IEEE)
    Drones can be used in agriculture applications to monitor crop yield and climate conditions and to extend the communication range of wireless sensor networks in monitoring areas. However, monitoring the climate conditions in agriculture applications faces challenges and limitations, such as drone flight time, power consumption, and communication distance, which are addressed in this study. Wireless power transfer (WPT) can be used to charge drone batteries. WPT using a magnetic resonant coupling (MRC) technique was considered in this study because it allows high transfer power and efficiency with tens of centimeters, power transfers can be achieved in misalignment situations, charging several devices simultaneously, and unaffected by weather conditions. WPT was practically implemented based on a solar cell using a proposed flat spiral coil (FSC) in the transmitter circuit and multiturn coil (MTC) in a receiver circuit (drone) for the alignment and misalignment of two coils at different distances. FSC and MTC improved power transfer and efficiency to 20.46 W and 85.25%, respectively, at 0 cm with the loaded system under alignment condition. In addition, the two coils achieved appropriate transfer efficiencies and power for charging the drone battery under misaligned conditions. The maximum power transfer and efficiency were 17.1 W and 71% for the misalignment condition, at an air gap of 1 cm between two coils when the system was loaded with the drone battery. Moreover, the battery life of the drone was extended to 851 minutes based on the proposed sleep/active strategy relative to the traditional operation (i.e., 25.84 minutes). Consequently, a 96.9% battery power saving was achieved based on this strategy. Comparison results showed that the proposed system outperformed some present techniques in terms of the transfer power, transfer efficiency, and drone battery life. The proposed WPT technique developed in this study has been proven to solve the misalignment issue. Thus it offers a great opportunity as a key deployment component for the automation of farming practices toward the Internet of Farming applications.

  • Power reduction with sleep/wake on redundant data (SWORD) in a wireless sensor network for energy-efficient precision agriculture
    Haider Jawad, Rosdiadee Nordin, Sadik Gharghan, Aqeel Jawad, Mahamod Ismail, and Mahmood Abu-AlShaeer

    The use of wireless sensor networks (WSNs) in modern precision agriculture to monitor climate conditions and to provide agriculturalists with a considerable amount of useful information is currently being widely considered. However, WSNs exhibit several limitations when deployed in real-world applications. One of the challenges faced by WSNs is prolonging the life of sensor nodes. This challenge is the primary motivation for this work, in which we aim to further minimize the energy consumption of a wireless agriculture system (WAS), which includes air temperature, air humidity, and soil moisture. Two power reduction schemes are proposed to decrease the power consumption of the sensor and router nodes. First, a sleep/wake scheme based on duty cycling is presented. Second, the sleep/wake scheme is merged with redundant data about soil moisture, thereby resulting in a new algorithm called sleep/wake on redundant data (SWORD). SWORD can minimize the power consumption and data communication of the sensor node. A 12 V/5 W solar cell is embedded into the WAS to sustain its operation. Results show that the power consumption of the sensor and router nodes is minimized and power savings are improved by the sleep/wake scheme. The power consumption of the sensor and router nodes is improved by 99.48% relative to that in traditional operation when the SWORD algorithm is applied. In addition, data communication in the SWORD algorithm is minimized by 86.45% relative to that in the sleep/wake scheme. The comparison results indicate that the proposed algorithms outperform power reduction techniques proposed in other studies. The average current consumptions of the sensor nodes in the sleep/wake scheme and the SWORD algorithm are 0.731 mA and 0.1 mA, respectively.

  • Hamiltonian perturbation of optical solitons with parabolic law nonlinearity using three integration methodologies
    Anwar Jaafar Mohamad Jawad, Mahmood Jawad Abu-AlShaeer, Anjan Biswas, Qin Zhou, Seithuti Moshokoa, and Milivoj Belic

    Elsevier BV

  • Optical solitons to Lakshmanan-Porsezian-Daniel model for three nonlinear forms
    Anwar Jaafar Mohamad Jawad, Mahmood Jawad Abu-AlShaeer, Anjan Biswas, Qin Zhou, Seithuti Moshokoa, and Milivoj Belic

    Elsevier BV

  • Optical soliton perturbation with exotic non-Kerr law nonlinearities
    Anwar Jaafar Mohamad Jawad, Mahmood Jawad Abu-AlShaeer, Fayequa B. Majid, Anjan Biswas, Qin Zhou, and Milivoj Belic

    Elsevier BV

  • Accurate fall detection and localization for elderly people based on neural network and energy-efficient wireless sensor network
    Sadik Gharghan, Saleem Mohammed, Ali Al-Naji, Mahmood Abu-AlShaeer, Haider Jawad, Aqeel Jawad, and Javaan Chahl

    Falls are the main source of injury for elderly patients with epilepsy and Parkinson’s disease. Elderly people who carry battery powered health monitoring systems can move unhindered from one place to another according to their activities, thus improving their quality of life. This paper aims to detect when an elderly individual falls and to provide accurate location of the incident while the individual is moving in indoor environments such as in houses, medical health care centers, and hospitals. Fall detection is accurately determined based on a proposed sensor-based fall detection algorithm, whereas the localization of the elderly person is determined based on an artificial neural network (ANN). In addition, the power consumption of the fall detection system (FDS) is minimized based on a data-driven algorithm. Results show that an elderly fall can be detected with accuracy levels of 100% and 92.5% for line-of-sight (LOS) and non-line-of-sight (NLOS) environments, respectively. In addition, elderly indoor localization error is improved with a mean absolute error of 0.0094 and 0.0454 m for LOS and NLOS, respectively, after the application of the ANN optimization technique. Moreover, the battery life of the FDS is improved relative to conventional implementation due to reduced computational effort. The proposed FDS outperforms existing systems in terms of fall detection accuracy, localization errors, and power consumption.

  • Single-tube and multi-turn coil near-field wireless power transfer for low-power home appliances
    Aqeel Jawad, Rosdiadee Nordin, Sadik Gharghan, Haider Jawad, Mahamod Ismail, and Mahmood Abu-AlShaeer

    Single-tube loop coil (STLC) and multi-turn copper wire coil (MTCWC) wireless power transfer (WPT) methods are proposed in this study to overcome the challenges of battery life during low-power home appliance operations. Transfer power, efficiency, and distance are investigated for charging mobile devices on the basis of the two proposed systems. The transfer distances of 1–15 cm are considered because the practicality of this range has been proven to be reliable in the current work on mobile device battery charging. For STLC, the Li-ion battery is charged with total system efficiencies of 86.45%, 77.08%, and 52.08%, without a load, at distances of 2, 6, and 15 cm, respectively. When the system is loaded with 100 Ω at the corresponding distances, the transfer efficiencies are reduced to 80.66%, 66.66%, and 47.04%. For MTCWC, the battery is charged with total system efficiencies of 88.54%, 75%, and 52.08%, without a load, at the same distances of 2, 6, and 15 cm. When the system is loaded with 100 Ω at the corresponding distances, the transfer efficiencies are drastically reduced to 39.52%, 33.6%, and 15.13%. The contrasting results, between the STLC and MTCWC methods, are produced because of the misalignment between their transmitters and receiver coils. In addition, the diameter of the MTCWC is smaller than that of the STLC. The output power of the proposed system can charge the latest smartphone in the market, with generated output powers of 5 W (STLC) and 2 W (MTCWC). The above WPT methods are compared with other WPT methods in the literature.

  • Soliton Solutions of the Coupled Schrödinger-Boussinesq Equations for Kerr Law Nonlinearity
    Anwar Ja’afar Mohamad Jawad and Mahmood Jawad Abu-AlShaeer

    Hindawi Limited
    In this paper, the coupled Schrödinger-Boussinesq equations (SBE) will be solved by the sech, tanh, csch, and the modified simplest equation method (MSEM). We obtain exact solutions of the nonlinear for bright, dark, and singular 1-soliton solution. Kerr law nonlinearity media are studied. Results have proven that modified simple equation method does not produce the soliton solution in general case. Solutions may find practical applications and will be important for the conservation laws for dispersive optical solitons.